DE102021117059B4 - Drive device for an electrified vehicle axle - Google Patents

Abstract

The invention relates to a drive device for an electrified vehicle axle of a vehicle, having an electric machine (1) which, via a gearbox (7), drives drive shafts (3, 4) leading to the vehicle wheels of the vehicle axle, and having a cooling and/or Lubricant module (13) that supplies the electric machine (1) and / or the transmission (7) with coolant and / or lubricant, wherein the electric machine (1), the transmission (7) and the module (13) to one are assembled in which the electric machine (1) and the coolant/lubricant module (13) are flanged to the transmission (7) at an axial distance from one another, and the electric machine (1) on its side axially opposite the transmission (7). has a radially protruding arm (35) which bridges a center distance (Δx) to the coolant/lubricant module (13) and which, at its free arm end (37) via at least one screw point (A), transmits force to the cooling/ Lubricant module (13) is connected, in particular to reduce operational vibrations in the unit. According to the invention, a stop element (49) that can be stroke-adjusted between a non-use position (N) and a support position (S) is provided at the boom end (37). Before tightening the screw point (A), the stop element (49) can be stroke-adjusted using a tolerance gap until it rests against the module support surface (55), so that the boom end (37) and the module (13) are free from tolerance-related Component deformations are braced together.

Description

The invention relates to a drive device for an electrified vehicle axle of a vehicle according to the preamble of claim 1.

An electrified vehicle axle of an at least partially electrically operated, two-track vehicle can have an electric machine that drives output shafts via a transmission, which lead to the vehicle wheels of the vehicle axle. In addition, an oil module is provided, which supplies the electric machine and/or the transmission with oil.

In a generic drive device, the electric machine, the transmission and the oil module are combined to form a frame-shaped, vibration-resistant structural unit. In this unit, the electric motor and the oil module are flanged to the transmission at an axial distance from one another. In addition, the electric machine has, on its side axially opposite the transmission, a radially protruding cantilever that bridges a center distance to the oil module. At its free boom end, the boom is connected to the oil module via screw points in a force-transmitting manner. In this way, operational vibrations in the frame-shaped structural unit can be reduced.

From the DE 10 2004 014 787 A1 an oil module is known. From the DE 197 39 668 A1 an oil pump module is known. From the DE 10 2017 004 778 A1 a tolerance-compensating connection arrangement is known. Furthermore, to the prior art according to DE 100 34 400 A1 , the DE 198 37 446 B4 , the DE 696 23 111 T2 , the JP 2017/067296 A and the U.S. 9,694,664 B2 as well as the WO 2012/120079 A1 to call.

The object of the invention is to provide a drive device in which assembly is made possible in a simple manner, essentially free of component deformations.

The object is solved by the features of claim 1. Preferred developments of the invention are disclosed in the dependent claims.

The invention is based on a drive device for an electrified vehicle axle, which has an electric machine, a transmission and a coolant and/or lubricant module that supplies the electric machine and/or the transmission with coolant and/or lubricant. The electric machine, the transmission and the module are combined to form a vibration-resistant, frame-shaped unit. In the unit, the electric machine and the coolant/lubricant module are flanged to the transmission at an axial distance from one another. The electric machine also has a radially protruding arm on its side axially opposite the transmission. This bridges an axis distance to the module. A free boom end is connected to the module via at least one screw point in a force-transmitting manner. In this way, operational vibrations in the unit can be reduced. According to the characterizing part of claim 1, a stop element is provided at the end of the boom, which is stroke-adjustable between a non-use position and a support position. In the non-use position, the stop element is spaced apart from a module support surface by a free tolerance gap. In this way, a module that is still dismantled can be assembled with the structural unit without interfering contours. Before the screw point is tightened, the stop element can be stroke-adjusted, using up the tolerance gap, until it is in contact with the module support surface. This is followed by a screwing process in which the boom end and the module can be clamped together free of tolerance-related component deformations.

In a technical implementation, the screw point can have a screw bolt. This can be guided through a screw hole in the end of the boom and its bolt shank can be brought into threaded engagement with an internally threaded bore on the module side. With regard to an implementation that is economical in terms of installation space, the stop element can be a stop sleeve which is integrated directly into the screwing point. In this case, the stop sleeve can have an unthreaded inner circumference and an outer circumference with an external thread. The stop sleeve can be brought into threaded engagement with an internal thread of the boom end via its external thread. For a compact design, it is preferred if the stop sleeve can be brought into threaded engagement with an internal thread in the screw hole of the boom end. To adjust the stroke, the worker screw-actuates the stop sleeve.

In a space-saving embodiment, the bolt shank of the screw bolt can be guided directly through the stop sleeve. In the support position, the end face of the stop sleeve can be brought into contact with an opening edge region of the internally threaded bore on the module side. In this case, the opening edge area of the module-side internally threaded bore forms the module support surface, against which the stop sleeve is supported in its support position.

In the clamped state, the boom end together with the stop sleeve between the bolt head of the screw bolt and the opening edge area of the module-side Be supported internally threaded bore. In a first variant, the bolt head can be supported directly on the end face of the stop sleeve facing away from the module. Alternatively, the bolt head may be supported on the opening edge portion of the screw hole of the boom end independently of the stop sleeve.

A simple assembly operation of the stop sleeve is important in view of a reduced process time in the assembly process. Against this background, the stop sleeve can have a tool attachment on its end face remote from the module, via which the stop sleeve can be screw-operated with the aid of a tool. To further simplify the assembly process, the tool attachment of the stop sleeve and a tool attachment of the screw bolt can be designed essentially the same. In this way, the stop sleeve and the screw bolt can be actuated with the same tool.

In a technical implementation, the screw point can be aligned parallel to the axis of the electric machine or to the module axis. To further reduce operational vibrations, the boom end can be connected to the module via at least a second screw point. Its screw axis can be aligned at right angles to the screw axis of the first screw point.

The second screw point can have a screw bolt, which can be guided through a screw hole in the boom end and can be brought into threaded engagement with an internally threaded bore hole on the module side with its bolt shank. In particular, transverse vibrations, ie vibrations transverse to the axis direction of the screw axis of the second screw location, can be blocked by means of the second screw location. For this purpose, the screw point can be constructed as follows: A compensating sleeve with a small hole clearance can be inserted into the screw hole of the boom end. The sleeve length can be larger than the screw hole length of the boom end. In this way, in the clamped state, the compensating sleeve is supported between the bolt head and the opening edge area of the internally threaded bore on the module side. In addition, the boom end is mounted in sliding contact with the outer circumference of the compensation sleeve so that it can be adjusted in the axial direction. Due to the small hole play between the compensating sleeve and the screw hole, transverse vibrations transverse to the axis direction are largely blocked.

In an assembly process, the electric machine is first brought into a flange connection with the gearbox. This creates a sufficiently large assembly clearance between the boom end of the electric machine and the gearbox. In a first process step, the module is introduced into this assembly clearance without any interfering contours. This is followed by a second process step, in which the module is advanced by one infeed stroke in the axial direction to the assembly position in which the flange connection between the module and the gearbox is made. In a further third process step, the boom end is clamped to the module at the screw point.

Power electronics are also assigned to the electric machine. This can be arranged in a space-saving manner on the upper side of the frame-shaped structural unit and span the interior space of the frame-shaped structural unit. In this case, a contact housing for electrical supply lines can also be integrated in the extension arm with a dual function. The power electronics are electrically connected to the electric machine with the aid of the electrical supply lines.

An exemplary embodiment of the invention is described below with reference to the accompanying figures.

• 1 in einem grob schematischen Blockschaltdiagramm die Antriebsvorrichtung der Erfindung;
• 2 in einer perspektivischen Darstellung die Antriebsvorrichtung im zusammengebauten Zustand;
• 3 und 4 eine Schraubstelle in unterschiedlichen Betriebszuständen;
• 5 in einer Ansicht entsprechend der 3 eine Variante der Schraubstelle;
• 6 eine weitere Schraubstelle; und
• 7 in einer Ansicht entsprechend der 2 die Antriebsvorrichtung mit noch demontiertem Ölmodul.

Show it:

• 1 in a roughly schematic block circuit diagram, the drive device of the invention;
• 2 in a perspective view, the drive device in the assembled state;
• 3 and 4 a screwing point in different operating states;
• 5 in a view according to the 3 a variant of the screw point;
• 6 another screw point; and
• 7 in a view according to the 2 the drive unit with the oil module still removed.

In the 1 a drive device for a vehicle axle of a two-track vehicle is shown in a simplified block circuit diagram. The vehicle axle has an electric machine 1, which is installed transversely and arranged axially parallel to the drive shafts 3, 4 leading to the vehicle wheels. The rotor shaft 5 of the electric machine 1 is in driving connection with the two drive shafts 3, 4 via a transmission 7. In the 1 the transmission 7 has a double spur gear stage, which is in driving connection with an input-side gear wheel 9 of an axle differential 11 . The axle differential 11 drives the drive shafts 3, 4 leading to the vehicle wheels on both sides away. In addition, the drive device has an oil module 13, the structure of which is described below only to the extent necessary for understanding the invention. Accordingly, the oil module 13 has an oil tank 15 which is connected to a pressure pump 17 via a suction line. A pressure line leads from the pressure pump 17 to a branching point at which the pressure line branches off into supply lines 19 , 21 . Via the supply line 19, oil is fed to the meshing points of the transmission 7. The oil drips from there and collects in a lubricating oil sump 23 . The oil is fed into the electric machine 1 via the supply line 21 . From there the oil also flows in the direction of the oil sump 23 . The oil collected in the oil sump 23 is returned to the oil tank 15 with the aid of a return pump 25 .

In the 2 the electric machine 1, the transmission 7 and the oil module 13 are assembled into a frame-shaped structural unit. In the structural unit, the electric machine 1 and the oil module 13 are flanged to the transmission 7 via flange connections 27, 29, spaced apart from one another by an axial distance Δx. Power electronics 31 (indicated by a dotted line) are assigned to electric machine 1 . This is located on top of the frame-shaped unit and spans the interior of the frame-shaped unit. The power electronics 31 is connected to the electric machine 1 via electrical supply lines in the 2 run within a contact housing 33. The contact housing 33 is part of an extension arm 35 which protrudes radially on the side of the electric machine which is axially opposite to the transmission 7 .

How from the 2 As can be seen, the boom 35 bridges the center distance Δx to the oil module 13. A free boom end 37 is connected to the oil module 13 in a force-transmitting manner via a total of four screw points A, B in order to reduce operational vibrations in the assembly.

How from the 2 shows, the screw points are divided into a total of two first screw points A and two second screw points B. The screw axes of the first screw points A are aligned in the vertical direction z. The screw axes of the screw points B are aligned in the axial direction of the electric machine 1 or the oil module 13 . In the 2 the oil module 13 has a shaft bushing 39 through which a drive shaft 3, 4 (not shown) is guided to the respective vehicle wheel.

The following is based on the 3 the structure of one of the screw points A is described. Accordingly, the screw point A has a screw bolt 41 . This is guided through a screw hole 43 of the boom end 37 and with its bolt shank 45 in threaded engagement with a module-side internally threaded bore 47. The screw point A is also assigned a stop sleeve 49. This has an unthreaded inner circumference and an outer circumference with an external thread 51 . The stop sleeve 49 is via its external thread 51 in threaded engagement with an internal thread 53 of the screw hole 43 of the boom end 37. In the 3 the bolt shank 45 of the screw bolt 41 is guided through the stop sleeve 49. By screwing the stop sleeve 49 between a in the 4 shown non-use position N and one in the 3 support position S shown are lifted. In the in the 3 Support position S shown is the stop sleeve 49 in contact with an opening edge portion 55 of the module-side internally threaded bore 47. The bolt head 57 of the bolt 41 is in the 3 supported on the opening edge portion of the screw hole 43 of the boom end 37. The stop sleeve 49 protrudes with an oversize Δh out of the screw hole 43 of the boom end 37, with the tolerance gap Δy ( 4 ) between the boom end 37 and the oil module 13 is bridged.

At its end facing away from the oil module 13, the stop sleeve 49 has a tool attachment 61, via which the stop sleeve 49 can be screw-operated. The tool attachment 61 of the stop sleeve 49 and the tool attachment 63 of the screw bolt 41 are essentially the same with a polygonal socket. Therefore, both the stop sleeve 49 and the screw bolt 41 can be actuated with the same tool.

In the 3 is the edge of the opening region 55 of the module-side internally threaded bore 47 facing away from the end face of the stop sleeve 49 within the screw hole 43 of the boom end 37. Therefore, in the 3 the bolt head 57 of the bolt 41 is supported directly on the opening edge portion of the bolt hole 43 of the boom end 37. Alternatively, in the 5 a variant of the screw point A is shown, in which the end face of the stop sleeve 49 facing away from the opening edge region 55 of the module-side internally threaded bore 47 protrudes beyond the boom end 37 with a projection a. In this case the bolt head 57 of the screw bolt 41 is supported directly on the stop sleeve 49 .

In the 6 the structure of one of the second screw points B is shown. Accordingly, the second screw point B has a screw bolt 65 which is guided through a screw hole 67 in the boom end 37 and has its bolt shank 69 in threaded engagement with an internally threaded bore 71 on the module side. Into the screw hole 67 of the outrigger End 37 is a compensating sleeve 73 used with a small hole clearance. The sleeve length I ₁ is dimensioned larger than the screw hole length I ₂ of the boom end 37. In the 6 a clamped state is shown, in which the compensating sleeve 73 is supported between the bolt head 75 of the screw bolt 67 and an opening edge region 77 of the internally threaded bore 71 on the module side. In this case, the boom end 37 is in sliding contact with the smooth-cylindrical outer circumference of the compensating sleeve, resulting in floating mounting in the axial direction, but transverse vibrations transverse to the axial direction are largely blocked.

Both the outer circumference and the inner circumference of the compensating sleeve 73 are smooth-cylindrical or unthreaded. The screw bolt 65 therefore extends through the compensating sleeve 73 without engaging a thread.

In the 7 the assembly is shown with the oil module 13 still dismantled. The structural unit has an assembly clearance f between the boom end 37 and the gear 7 . In a first process step, the oil module 13 is introduced into the assembly clearance f in an assembly direction x without any interfering contours. This is followed by a second process step, in which the oil module 13 is advanced by an infeed stroke in the axial direction y into an assembly position. In the assembly position, the flange connection 29 can be established between the oil module 13 and the transmission 7 . In a final, third process step, the boom end 37 is clamped to the oil module 13 at the screw points A, B. Before the clamping process is carried out, the stop sleeve 49 is brought into contact with the opening edge region 55 of the internally threaded bore 47 on the module side (see 3 ).

Reference List

1

electric machine

3.4

drive shafts

5

rotor shaft

7

transmission

9

input gear

11

axle differential

13

oil module

15

oil tank

17

pressure pump

19, 21

supply lines

23

oil sump

25

return pump

27.29

flange connections

31

power electronics

33

contact housing

35

boom

37

boom end

39

shaft bushing

41

bolts

43

screw hole

45

bolt shank

47

internal thread hole on the module side

49

stop sleeve

51

external thread

53

Screw hole internal thread

55

opening edge area

57

bolt head

61.63

tool approaches

65

bolts

67

screw hole

69

bolt shank

71

internal thread hole on the module side

73

compensating sleeve

75

bolt head

77

opening edge area

Δx

center distance

Δh

excess

Δy

tolerance gap

f

assembly clearance

I1

Sleeve Length

I2

screw hole length

N

non-use position

S

support position

AWAY

screw points

a

Got over

Claims (11)

Drive device for an electrified vehicle axle of a vehicle, with an electric machine (1) which drives drive shafts (3, 4) via a gearbox (7) which lead to the vehicle wheels of the vehicle axle, and with a coolant and/or lubricant module ( 13), which supplies the electric machine (1) and / or the transmission (7) with coolant and / or lubricant, the electric The machine (1), the transmission (7) and the module (13) are combined to form a structural unit in which the electric machine (1) and the coolant/lubricant module (13) are flanged to the transmission (7) at an axial distance from one another , and wherein the electric machine (1) on its side axially opposite the transmission (7) has a radially projecting arm (35) which bridges an axis distance (Δx) to the coolant/lubricant module (13) and which on its free arm - end (37) is connected to the coolant/lubricant module (13) in a force-transmitting manner via at least one screw point (A), in particular in order to reduce operational vibrations in the structural unit, characterized in that at the boom end (37) there is an between a non-use position (N) and a support position (S) is provided with a stroke-adjustable stop element (49), and that the stop element (49) in the non-use position (N) is spaced apart from a module support surface (55) by a free tolerance gap t, and that before the screw point (A) is tightened, the stop element (49) can be adjusted in a stroke, using up the tolerance gap, until it comes into contact with the module support surface (55), so that the extension arm end (37) and the module (13) can be clamped together free of tolerance-related component deformations. drive device claim 1 , characterized in that the screw point (A) has a screw bolt (41) which can be guided through a screw hole (43) of the boom end (37) and which can be brought into threaded engagement with a module-side internally threaded bore (47) with its bolt shank (45). is. drive device claim 2 , characterized in that the stop element (49) is a stop sleeve which has an unthreaded inner circumference and an outer circumference with an external thread (51) via which the stop sleeve (49) is threadedly engaged with an internal thread (53) of the boom end (37) and that the internal thread (53) is formed in the screw hole (43) of the boom end (37), and/or that the stop sleeve (49) can be screw-operated for a stroke adjustment. drive device claim 3 , characterized in that the bolt shank (45) of the screw bolt (41) can be guided through the stop sleeve (49) and/or that in the supporting position (S) an end face of the stop sleeve (49) is in contact with an opening edge area (55) of the Internally threaded bore (47) of the module (13), which forms the module support surface. drive device claim 3 or 4 , characterized in that in the clamped state the boom end (37) together with the stop sleeve (49) is supported between the bolt head (57) of the screw bolt (41) and the opening edge area (55) of the internally threaded bore (47) of the module (13), and that the bolt head (57) is supported directly on the end face of the stop sleeve facing away from the module (13), or that the bolt head (57) is supported independently of the stop sleeve (49) on the opening edge area of the screw hole (59) of the boom end (37 ) is supported. Drive device according to one of claims 3 , 4 or 5 , characterized in that the stop sleeve (49) has a tool attachment (61) on its end face remote from the module (13), via which the stop sleeve (49) can be screw-operated, and that the tool attachment (61) of the stop sleeve (49) and a tool attachment (63) of the screw bolt (41) are essentially the same, so that the stop sleeve (49) and the screw bolt (41) can be actuated with the same tool. Drive device according to one of the preceding claims, characterized in that the screw point (A) is aligned axially parallel to the electric machine axis or to the module axis, and/or in that, to further reduce operationally-related vibrations, the boom end (37) has at least a second Screw point (B) can be connected to the module (13), the screw axis of which is aligned at right angles to the screw axis of the first screw point (A). drive device claim 7 , characterized in that the second screw point (B) has a screw bolt (65) which can be guided through a screw hole (67) in the boom end (37) and with its bolt shank (69) in threaded engagement with a module-side internally threaded bore (71) is bringable. drive device claim 8 , characterized in that in the screw hole (67) of the jib end (37) a compensating sleeve with a small hole clearance is inserted, the sleeve length (I ₁ ) of which is greater than the screw hole length (I ₂ ) of the jib end (37 ), and that in particular in the tightened state the compensating sleeve (73) is supported between the bolt head (75) and the opening edge area (77) of the module-side internally threaded bore (71) and the extension arm end (37) is in sliding contact with the compensating sleeve outer circumference in the axial direction is adjustable, but transverse vibrations are blocked transversely to the axis direction. Drive device according to one of the preceding claims, characterized in that that when the module (13) is still dismantled, the structural unit has an assembly clearance (f) between the boom end (37) and the gear (7), and that in a first process step the module (13) can be inserted into the assembly clearance (f) without interfering contours is, in a second process step, the module (13) can be advanced by an infeed stroke in the axial direction to an assembly position in which the flange connection (29) between the module (13) and the transmission (7) can be produced, and in a third process step the boom end (37) can be clamped to the module (13) at the screw point (A, B). Drive device according to one of the preceding claims, characterized in that the electric machine (1) is assigned power electronics (31) which are arranged on the upper side of the frame-shaped structural unit, and that the extension arm (35) has a contact housing (33) for electrical supply lines, via which the power electronics (31) can be connected to the electric machine (1).

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